Criminal discovery has outstripped Justice Brennan's claim of "mixed" results. His description of the twenty-five year transformation as merely "rapid" is too modest. From the picture in 1963, which he accurately describes as "quite a bleak one," discovery is, today, de rigueur in criminal cases. There is little to suggest a general reduction of criminal case discovery in the future.
Steven H. Goldberg, What Was Discovered in the Quest for Truth?, 68 Wash. U. L.Q. 51 (1990), available at http://digitalcommons.pace.edu/lawfaculty/82/.